A law enforcement officer wearing a bulletproof vest was shot twice in the right chest. He has mild respiratory distress with hemoptysis and diminished lung sounds on the right. Which injury should you suspect?

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Pulmonary contusion is the bruise of lung tissue from chest trauma that causes bleeding into the lung and edema, leading to impaired gas exchange. In this scenario, the officer has been hit in the chest, with mild respiratory distress, hemoptysis (blood in the airway), and decreased breath sounds on the right. Those findings fit lung tissue injury rather than air or fluid in the pleural space. The presence of blood in the airways points to alveolar or interstitial bleeding within the lung itself, which is the hallmark of contusion, and diminished sounds reflect patchy, nonuniform involvement of the lung.

Pneumothorax would more often present with sudden, severe distress, possible hyperresonant percussion, and decreased breath sounds due to air in the pleural space, sometimes with chest wall changes or tracheal shift if it becomes tension. Hemothorax would typically cause dullness to percussion and decreased breath sounds from blood in the pleural space and can lead to hypotension, but the hallmark sign of bleeding into the airways (hemoptysis) points toward pulmonary parenchymal injury rather than just pleural bleeding. Tension pneumothorax is an emergency with rapid deterioration and signs like tracheal deviation and severe instability, which aren’t described here.

So, the combination of chest trauma with hemoptysis and localized respiratory findings best fits a pulmonary contusion.